Free planning tool
How much water
should we start with?
Estimate a baseline, then adjust for your household and local guidance.
Calculation: people × days × 1 US gallon. The baseline covers drinking and other essential uses; it does not include extra water for pets or individual needs.
Your starting supply
CDC recommends at least one gallon per person per day for three days, with more for pets, pregnancy, illness, and hot climates. Consider a two-week supply when possible.
Further reading: CDC: Emergency water supply. Follow local official instructions for current conditions.
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